I believe the warranty IS transferable, but is 2 yrs for the '07 hull (1 year on the Drive) and 2 years on both hull and Drive for the '09.
You've done a good job of spotting the differences, the most significant of which is the C & G. Both hulls are otherwise almost identical (slightly different rudder tube arrangement) and will give you the same performance.
Upgrading the '07 drums and cable/chains runs about $130 (I think), so if you were to do that, you could subtract it from the price difference, but add $23 for the large rudder for the '09. So now you're looking at about $300 and the value of the color difference?
A lot of your decision might bear on the condition of the '07. If it is a bit scratched up with stretched out pockets, out of warranty and in need of a Drive upgrade, AND you you're meticulous about your equipment, it sounds like the '09 is the better value.
On the other hand, if it is really clean and your dealer will make you a nice package deal with the Drive upgrade, Turbofins and cart, the '07 can be an excellent boat on a tight budget. Your dealer may be a little more motivated to sell one or the other. Personally, I'd ask him for an out the door price on both including the equipment and upgrades you need -- then make your decision.
I personally agree with Kayaking Bob that the difference in value is probably there, especially considering your color preference. On the other hand, I wouldn't encourage you to spend more than you're comfortable with, especially if it causes any financial or emotional strain for you or your wife. Either will do the job very nicely -- they have the same capability!